CVE-2026-40386: In libexif through 0.6.25, an integer underflow in size checking for Fuji and Olympus MakerNote decoding could

Q: How do I fix CVE-2026-40386?

libexif: upgrade to newer than 0.6.25. Exact commands for each OS are on this page.

Q: Is CVE-2026-40386 being exploited?

CVE-2026-40386 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40386 affect?

CVE-2026-40386 affects libexif. Severity is medium (CVSS 4.0). In libexif through 0.6.25, an integer underflow in size checking for Fuji and Olympus MakerNote decoding could be used by attackers to crash or leak information out of libexif-using programs.

Q: How urgent is CVE-2026-40386?

Priority 15/100. No elevated risk signals yet.

Routine

MEDIUM 4.0UPGRADE

CVE-2026-40386 is a medium-severity flaw (CVSS 4.0) affecting libexif. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In libexif through 0.6.25, an integer underflow in size checking for Fuji and Olympus MakerNote decoding could be used by attackers to crash or leak information out of libexif-using programs.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.0 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-191
Published	2026-04-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: libexif project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-12 19:16 UTCPublished CVE record published
2026-06-17 10:45 UTCUpdated Record last modified

libexif project libexif UPGRADE

Affected: <= 0.6.25

Fixed in: newer than 0.6.25

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libexif || rpm -q libexif || libexif --version

2. UPGRADE to newer than 0.6.25 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libexif

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libexif

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:22553] Moderate: libexif security update 2026-06-03

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40386?

libexif: upgrade to newer than 0.6.25. Exact commands for each OS are on this page.

Is CVE-2026-40386 being exploited?

CVE-2026-40386 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40386 affect?

CVE-2026-40386 affects libexif. Severity is medium (CVSS 4.0). In libexif through 0.6.25, an integer underflow in size checking for Fuji and Olympus MakerNote decoding could be used by attackers to crash or leak information out of libexif-using programs.

How urgent is CVE-2026-40386?

Priority 15/100. No elevated risk signals yet.

Related CVEs

CVE-2026-40385 MEDIUM 4.0 UPGRADE In libexif through 0.6.25, an unsigned 32bit integer overflow in Nikon MakerNote handling could be used by loc
CVE-2026-32775 HIGH 7.4 UPGRADE libexif through 0.6.25 has a flaw in decoding MakerNotes

References

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